Differences

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--- software_behav [2017/06/06 09:48] – [System Commands] admin
+++ software_behav [2017/06/06 11:20] (current) – [Commands Core Set] admin
@@ Line 146: / Line 146: @@
+===Commands for reading and modifying EEPROM ===
+Most of the operations required for reading and writing the EEPROM can be accomplished by reading/writing IO registers through the proper command (seeding address, seeting data for write). However actual writing requires a sequence of operation that can only managed by a aproper sequence of code ("arming" the writing mechanism and issuing the writing command within four clock cycles).
+Therefore a dedicated command for writing is required, while reading can be accomplished to the data writing commands. However, we can define a specific command for EEPROM reading.
+^MNEM^Description^byte1^byte2^byte3^byte4^byte5^byte6^
+|**EERB**|Read a byte from EEPROM |4|cc|ADD H|ADD L | | |
+|**EEWB**|Write a byte to EEPROM |5|cc|ADD H|ADD L |VAL | |
+==== Commands Core Set ====
+Command core set is the minimum sets of commands that need to be implemented and whose action cannot be replicated with a combinations of other commands in the same set.
+As we have note before, for instance, the FLCP command, while useful, is not a core command: we can obtain the same effect by using a series of FLRW and FLWW.
+At this stage, the commands that appear to belong to the core set are:
+**RRAM**,**WRAM**,**FLRW**,**FLWW**,**FLPG** and **EEWB**;
+This means that the minimum length for the CVT should be 16, with a margin for two more core system command (in case we realize we have forgotten something) and a set of 7 user comments.
+The other commands listed so far (RPG0, WP0M, FLCP and EERB) can be included in the immediate super-set (len(CVT)=32) together with other commands for ase of use.
+The target should be, however, to start in any case with the core command set ( from now on CMN_LVL_0) and to obtain reconfiguration toward richer command sets using the core command set. In short, we should insure that once a SNC is programmed with the core command set (with an external programmer), it can be upgraded by the MNC through ANT.